My baby daddy is my uncle. How do I tell my son?

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I am a single mother and my son is 11. Lately he has become very stubborn and is asking questions about his biological father. The problem is that at the time of his conception I was having an affair with my uncle. I was 17 and naive but the relationship was consensual, he did not force me into anything. He knows that he is the father of my son and he helps me to raise him but nobody else knows about this. My son is very keen on this because he is being harassed in school when he cannot tell the other boys who his father is. He is nagging and I don’t think he is going to let go of this until he gets to the bottom of this matter. I just don’t know what to do now. {Vivian}

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